Variable-length coding and decoding methods for image data

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EP 1 914 997 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	30.07.2008 Bulletin 2008/31

(43)	Date of publication A2:
	23.04.2008 Bulletin 2008/17

(21)	Application number: 08100822.9

(22)	Date of filing: 16.12.1994

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International Patent Classification (IPC):

H04N 7/50^(2006.01)

(84)	Designated Contracting States:
	DE FR GB

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Priority:

16.12.1993 KR 930028074
15.12.1994 KR 19940034497

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	04019815.2 / 1494484
	99124622.4 / 0987899
	95903454.7 / 0685137

(71)	Applicant: Samsung Electronics Co., Ltd
	Suwon-si, Gyeonggi-do 442-742 (KR)

(72)	Inventors:
	Jo, Jae Moon Seongnam-city (KR) Jeon, Je Chang 137-130 Seoul (KR)

(74)	Representative: Waddington, Richard
	Appleyard Lees 15 Clare Road Halifax, Yorkshire HX1 2HY Halifax, Yorkshire HX1 2HY (GB)

(54)	Variable-length coding and decoding methods for image data

(57) An adaptive variable-length coding/decoding method performs an optimal variable-length coding and decoding depending on an intra mode/inter mode condition and a current zigzag scanning position, such that a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to statistical characteristics of the [run, level] data are set. One of the variable-length coding tables is selected according to mode and scanning position, and the orthogonal transform coefficients according to the selected variable-length coding table are variable-length coded.

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